Just make sure the tune is upbeat and he lyrics dont sing about sex, drugs or death in clear simple words and you're alright.
My favourite childhood songs included:
Marc Almond - Days of Pearley Spencer
Simon and Garfunkel - The Sound of Silence
Meatloaf - Paradise by the Dashboard Light
Bob Dylan - Masters of War
Siouxsie and the Banshees - Spellbound
Tom Lehrer - The Masochism Tango
Not refuting you, just saying, if you want to raise a screwed up morbid little gee...awesome dude like me, chuck in some variety. My family used to sing along in the car to both the classic Tom Lehrer albums when I was about six or seven, which, looking back on it, I appreciate is probably not at all normal. But the upshot is I had an endless playground stock of songs about drugs, sex, nuclear war, sadism and animal abuse.